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d in (-oo:+oo)
8 = (2/3)*d // - (2/3)*d
8-((2/3)*d) = 0
(-2/3)*d+8 = 0
8-2/3*d = 0 // - 8
-2/3*d = -8 // : -2/3
d = -8/(-2/3)
d = 12
d = 12
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